| 1 |
C $Header: /u/gcmpack/MITgcm/model/src/update_etah.F,v 1.11 2011/04/27 22:20:22 jmc Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "PACKAGES_CONFIG.h" |
| 5 |
#include "CPP_OPTIONS.h" |
| 6 |
|
| 7 |
CBOP |
| 8 |
C !ROUTINE: UPDATE_ETAH |
| 9 |
C !INTERFACE: |
| 10 |
SUBROUTINE UPDATE_ETAH( myTime, myIter, myThid ) |
| 11 |
C !DESCRIPTION: \bv |
| 12 |
C *==========================================================* |
| 13 |
C | SUBROUTINE UPDATE_ETAH |
| 14 |
C | o Update etaH after mom-correction-step/integr_continuity |
| 15 |
C | (required with NLFS to derive surface layer thickness) |
| 16 |
C | o Also derive SSH tendency at grid-cell Western and |
| 17 |
C | Southern edges (for hybrid sigma-coordinate) |
| 18 |
C *==========================================================* |
| 19 |
C \ev |
| 20 |
|
| 21 |
C !USES: |
| 22 |
IMPLICIT NONE |
| 23 |
C == Global variables |
| 24 |
#include "SIZE.h" |
| 25 |
#include "EEPARAMS.h" |
| 26 |
#include "PARAMS.h" |
| 27 |
#include "DYNVARS.h" |
| 28 |
#include "GRID.h" |
| 29 |
#include "SURFACE.h" |
| 30 |
#include "FFIELDS.h" |
| 31 |
|
| 32 |
C !INPUT/OUTPUT PARAMETERS: |
| 33 |
C == Routine arguments == |
| 34 |
C myTime :: Current time in simulation |
| 35 |
C myIter :: Current iteration number in simulation |
| 36 |
C myThid :: Thread number for this instance of the routine. |
| 37 |
_RL myTime |
| 38 |
INTEGER myIter |
| 39 |
INTEGER myThid |
| 40 |
|
| 41 |
C !LOCAL VARIABLES: |
| 42 |
#ifdef EXACT_CONSERV |
| 43 |
C Local variables in common block |
| 44 |
|
| 45 |
C Local variables |
| 46 |
C i,j,bi,bj :: Loop counters |
| 47 |
INTEGER i,j,bi,bj |
| 48 |
CEOP |
| 49 |
|
| 50 |
|
| 51 |
DO bj=myByLo(myThid),myByHi(myThid) |
| 52 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 53 |
|
| 54 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 55 |
|
| 56 |
C-- before updating etaH, save current etaH field in etaHnm1 |
| 57 |
DO j=1-Oly,sNy+Oly |
| 58 |
DO i=1-Olx,sNx+Olx |
| 59 |
etaHnm1(i,j,bi,bj) = etaH(i,j,bi,bj) |
| 60 |
ENDDO |
| 61 |
ENDDO |
| 62 |
|
| 63 |
C-- Update etaH at the end of the time step : |
| 64 |
C Incorporate the Explicit part of -Divergence(Barotropic_Flow) |
| 65 |
|
| 66 |
IF (implicDiv2Dflow.EQ. 1. _d 0) THEN |
| 67 |
DO j=1-Oly,sNy+Oly |
| 68 |
DO i=1-Olx,sNx+Olx |
| 69 |
etaH(i,j,bi,bj) = etaN(i,j,bi,bj) |
| 70 |
ENDDO |
| 71 |
ENDDO |
| 72 |
|
| 73 |
ELSE |
| 74 |
DO j=1,sNy |
| 75 |
DO i=1,sNx |
| 76 |
etaH(i,j,bi,bj) = etaN(i,j,bi,bj) |
| 77 |
& + (1. - implicDiv2Dflow)*dEtaHdt(i,j,bi,bj) |
| 78 |
& *deltaTfreesurf |
| 79 |
ENDDO |
| 80 |
ENDDO |
| 81 |
ENDIF |
| 82 |
|
| 83 |
#ifdef ALLOW_OBCS |
| 84 |
C-- Apply OBC to etaH (NonLin-FreeSurf): needed since viscous terms |
| 85 |
C depend on hFacZ which is not only function of boundary hFac values. |
| 86 |
IF ( useOBCS.AND.nonlinFreeSurf.GT.0 ) |
| 87 |
& CALL OBCS_APPLY_ETA( bi, bj, etaH, myThid ) |
| 88 |
#endif /* ALLOW_OBCS */ |
| 89 |
|
| 90 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 91 |
|
| 92 |
C- end bi,bj loop. |
| 93 |
ENDDO |
| 94 |
ENDDO |
| 95 |
|
| 96 |
IF ( implicDiv2Dflow .NE. 1. _d 0 .OR. |
| 97 |
& ( useOBCS.AND.nonlinFreeSurf.GT.0 ) ) |
| 98 |
& CALL EXCH_XY_RL( etaH, myThid ) |
| 99 |
|
| 100 |
c IF (useRealFreshWaterFlux .AND. myTime.EQ.startTime) |
| 101 |
c & _EXCH_XY_RL( PmEpR, myThid ) |
| 102 |
|
| 103 |
#ifdef NONLIN_FRSURF |
| 104 |
# ifndef DISABLE_SIGMA_CODE |
| 105 |
IF ( nonlinFreeSurf.GT.0 .AND. selectSigmaCoord.NE.0 ) THEN |
| 106 |
|
| 107 |
DO bj=myByLo(myThid),myByHi(myThid) |
| 108 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 109 |
C- 2nd bi,bj loop : |
| 110 |
|
| 111 |
C-- copy etaHX -> dEtaXdt |
| 112 |
DO j=1-Oly,sNy+Oly |
| 113 |
DO i=1-Olx,sNx+Olx |
| 114 |
dEtaWdt(i,j,bi,bj) = etaHw(i,j,bi,bj) |
| 115 |
dEtaSdt(i,j,bi,bj) = etaHs(i,j,bi,bj) |
| 116 |
ENDDO |
| 117 |
ENDDO |
| 118 |
|
| 119 |
DO j=1,sNy+1 |
| 120 |
DO i=1,sNx+1 |
| 121 |
etaHw(i,j,bi,bj) = ( etaH (i-1,j,bi,bj) |
| 122 |
& + etaH ( i ,j,bi,bj) )*0.5 _d 0 |
| 123 |
etaHs(i,j,bi,bj) = ( etaH (i,j-1,bi,bj) |
| 124 |
& + etaH (i, j ,bi,bj) )*0.5 _d 0 |
| 125 |
c etaHw(i,j,bi,bj) = 0.5 _d 0 |
| 126 |
c & *( etaH (i-1,j,bi,bj)*rA(i-1,j,bi,bj) |
| 127 |
c & + etaH ( i ,j,bi,bj)*rA( i ,j,bi,bj) |
| 128 |
c & )*recip_rAw(i,j,bi,bj) |
| 129 |
c etaHs(i,j,bi,bj) = 0.5 _d 0 |
| 130 |
c & *( etaH (i,j-1,bi,bj)*rA(i,j-1,bi,bj) |
| 131 |
c & + etaH (i, j ,bi,bj)*rA(i, j ,bi,bj) |
| 132 |
c & )*recip_rAs(i,j,bi,bj) |
| 133 |
ENDDO |
| 134 |
ENDDO |
| 135 |
|
| 136 |
C- end 2nd bi,bj loop. |
| 137 |
ENDDO |
| 138 |
ENDDO |
| 139 |
|
| 140 |
CALL EXCH_UV_XY_RL( etaHw, etaHs, .FALSE., myThid ) |
| 141 |
CALL EXCH_XY_RL( dEtaHdt, myThid ) |
| 142 |
|
| 143 |
DO bj=myByLo(myThid),myByHi(myThid) |
| 144 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
| 145 |
C- 3rd bi,bj loop : |
| 146 |
|
| 147 |
DO j=1-Oly,sNy+Oly |
| 148 |
DO i=1-Olx,sNx+Olx |
| 149 |
dEtaWdt(i,j,bi,bj) = ( etaHw(i,j,bi,bj) |
| 150 |
& - dEtaWdt(i,j,bi,bj) )/deltaTfreesurf |
| 151 |
dEtaSdt(i,j,bi,bj) = ( etaHs(i,j,bi,bj) |
| 152 |
& - dEtaSdt(i,j,bi,bj) )/deltaTfreesurf |
| 153 |
ENDDO |
| 154 |
ENDDO |
| 155 |
|
| 156 |
C- end 3rd bi,bj loop. |
| 157 |
ENDDO |
| 158 |
ENDDO |
| 159 |
|
| 160 |
ENDIF |
| 161 |
# endif /* DISABLE_SIGMA_CODE */ |
| 162 |
#endif /* NONLIN_FRSURF */ |
| 163 |
|
| 164 |
#endif /* EXACT_CONSERV */ |
| 165 |
|
| 166 |
RETURN |
| 167 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph